FACTORIAL()
 To return the value of a factorial.
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 Syntax

      FACTORIAL(<nInteger>) -> nFactorial

 Arguments

      <nInteger> is a numeric integer that is used to compute a factorial.

 Returns

      FACTORIAL() returns the value of a factorial

 Description

      A factorial value is the result of multiplying an integer by every
      integer below it.

      For example, the factorial of 6 is equal to (6*5*4*3*2*1 = 720).

 Examples

      ? Str( FACTORIAL(6), 5,0)  // returns   720

 Files: CALC.LIB

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